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Cheap flights from London to Southeast Asia from €349

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to Southeast Asia departing on 29/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from London to Southeast Asia

Cheap return flights

Enter your travel dates to find the best prices.
China Southern Logo
22:00 - 22:30LHR-BKK
17h 30m1 stop
China Southern Logo
15:45 - 14:00BKK-LHR
29h 15m2 stops
€529China Southern
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Thu, 12 Mar - Sat, 21 Mar
Multiple Airlines Logo
11:05 - 16:15LGW-SIN
21h 10m1 stop
Multiple Airlines Logo
00:25 - 06:30SIN-LGW
38h 05m1 stop
€530Multiple Airlines
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Mon, 10 Nov - Mon, 17 Nov
Multiple Airlines Logo
13:05 - 17:20LGW-SIN
44h 15m2 stops
Multiple Airlines Logo
17:50 - 06:55SIN-LGW
21h 05m1 stop
€537Multiple Airlines
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Mon, 10 Nov - Mon, 17 Nov
Air China Logo
17:40 - 18:05LHR-BKK
17h 25m1 stop
Air China Logo
01:30 - 15:55BKK-LHR
21h 25m1 stop
€540Air China
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Sun, 16 Nov - Sun, 30 Nov
Shenzhen Airlines Logo
21:10 - 02:15LHR-BKK
22h 05m1 stop
Shenzhen Airlines Logo
12:10 - 19:10BKK-LHR
38h 00m1 stop
€542Shenzhen Airlines
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Fri, 5 Dec - Thu, 18 Dec
Shenzhen Airlines Logo
21:10 - 11:10LHR-BKK
31h 00m1 stop
Shenzhen Airlines Logo
19:30 - 19:10BKK-LHR
30h 40m1 stop
€543Shenzhen Airlines
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Fri, 7 Nov - Tue, 18 Nov
Gulf Air Logo
10:35 - 12:30LGW-SIN
17h 55m1 stop
Gulf Air Logo
20:25 - 06:20SIN-LGW
17h 55m1 stop
€545Gulf Air
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Wed, 11 Feb - Thu, 26 Feb
Gulf Air Logo
10:35 - 12:30LGW-SIN
17h 55m1 stop
Gulf Air Logo
20:25 - 06:20SIN-LGW
17h 55m1 stop
€546Gulf Air
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Wed, 14 Jan - Thu, 22 Jan
Austrian Airlines Logo
09:05 - 12:20LHR-BKK
20h 15m1 stop
Austrian Airlines Logo
23:40 - 08:20BKK-LHR
14h 40m1 stop
€547Austrian Airlines
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Sun, 22 Mar - Tue, 26 May
Air China Logo
17:40 - 18:05LHR-BKK
17h 25m1 stop
Air China Logo
01:30 - 15:55BKK-LHR
21h 25m1 stop
€559Air China
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Mon, 17 Nov - Wed, 3 Dec

China Southern flights from London to Southeast Asia

Our best China Southern deals on London to Southeast Asia flight tickets
China Southern
12 Mar
LHR22:00London Heathrow
17h 30m
1 stop
BKK22:30Bangkok Suvarnabhumi
21 Mar
BKK15:45Bangkok Suvarnabhumi
29h 15m
2 stops
LHR14:00London Heathrow
€529
Find similar
China Southern
17 Mar
LHR22:00London Heathrow
30h 25m
1 stop
BKK11:25Bangkok Suvarnabhumi
27 Mar
BKK08:20Bangkok Suvarnabhumi
17h 15m
1 stop
LHR18:35London Heathrow
€544
Find similar
China Southern
17 Nov
LHR22:00London Heathrow
20h 05m
1 stop
BKK01:05Bangkok Suvarnabhumi
4 Dec
BKK08:20Bangkok Suvarnabhumi
17h 15m
1 stop
LHR18:35London Heathrow
€544
Find similar

Air China flights from London to Southeast Asia

Our best Air China deals on London to Southeast Asia flight tickets
Air China
16 Nov
LHR17:40London Heathrow
17h 25m
1 stop
BKK18:05Bangkok Suvarnabhumi
30 Nov
BKK01:30Bangkok Suvarnabhumi
21h 25m
1 stop
LHR15:55London Heathrow
€540
Find similar
Air China
17 Nov
LHR17:40London Heathrow
17h 25m
1 stop
BKK18:05Bangkok Suvarnabhumi
3 Dec
BKK01:30Bangkok Suvarnabhumi
21h 25m
1 stop
LHR15:55London Heathrow
€559
Find similar
Air China
17 Nov
LHR17:40London Heathrow
17h 25m
1 stop
BKK18:05Bangkok Suvarnabhumi
3 Dec
BKK01:30Bangkok Suvarnabhumi
21h 25m
1 stop
LHR15:55London Heathrow
€560
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from London to Southeast Asia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 13,528 searches. Data last updated 26 October 2025.
Use the filters below to find and compare flights from London to Southeast Asia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Thu 12/3

22:00-22:30

1 stop17h 30m

Bangkok Suvarnabhumi

Sat 21/3

15:45-14:00

2 stops29h 15m

€529

LondonSingapore

LGW - SIN

LGWSIN

London Gatwick

Mon 10/11

11:05-16:15

1 stop21h 10m

Singapore Changi

Mon 17/11

00:25-06:30

1 stop38h 05m

€530

LondonSingapore

LGW - SIN

LGWSIN

London Gatwick

Mon 10/11

13:05-17:20

2 stops44h 15m

Singapore Changi

Mon 17/11

17:50-06:55

1 stop21h 05m

€537

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 16/11

17:40-18:05

1 stop17h 25m

Bangkok Suvarnabhumi

Sun 30/11

01:30-15:55

1 stop21h 25m

€540

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Fri 5/12

21:10-02:15

1 stop22h 05m

Bangkok Suvarnabhumi

Thu 18/12

12:10-19:10

1 stop38h 00m

€542

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Fri 7/11

21:10-11:10

1 stop31h 00m

Bangkok Suvarnabhumi

Tue 18/11

19:30-19:10

1 stop30h 40m

€543

LondonSingapore

LGW - SIN

LGWSIN

London Gatwick

Wed 11/2

10:35-12:30

1 stop17h 55m

Singapore Changi

Thu 26/2

20:25-06:20

1 stop17h 55m

€545

LondonSingapore

LGW - SIN

LGWSIN

London Gatwick

Wed 14/1

10:35-12:30

1 stop17h 55m

Singapore Changi

Thu 22/1

20:25-06:20

1 stop17h 55m

€546

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 22/3

09:05-12:20

1 stop20h 15m

Bangkok Suvarnabhumi

Tue 26/5

23:40-08:20

1 stop14h 40m

€547

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Mon 17/11

17:40-18:05

1 stop17h 25m

Bangkok Suvarnabhumi

Wed 3/12

01:30-15:55

1 stop21h 25m

€559

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Southeast Asia from

How to get the cheapest flight ticket from London to Southeast Asia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Southeast Asia?

The cheapest month to fly to Southeast Asia from London is in May. Flight prices, which tend to average around €464, are often lower during this time because this is during the off-season. If you’re not able to fly to Southeast Asia in May, then September is your next best option. Flight prices from London to Southeast Asia during September average around €627.

What is the cheapest day to depart on your flight to Southeast Asia?

The cheapest day to depart from London to Southeast Asia is on a Wednesday. Travellers who choose to depart for Southeast Asia on a Wednesday will often find tickets for as low as €793. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around €1,163. These prices are subject to change though, so be sure to set up a Price Alert for flights to Southeast Asia.

What is the cheapest time of day to depart on your flight to Southeast Asia?

Our most recent data shows that the best time of day to fly to Southeast Asia is in the afternoon. Flights from London to Southeast Asia during this time can be as low as €684. Flights to Southeast Asia are more costly in the evening, with an average ticket price of €922. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest London to Southeast Asia flight route?

Fly from London Gatwick to Bangkok Suvarnabhumi for the best London - Southeast Asia flight prices

How far in advance should I book a flight to Southeast Asia?

You are more likely to see cheaper flights to Southeast Asia from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Southeast Asia for around €812 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Southeast Asia from London for as low as €749 on momondo.

What cabin class options are available on London to Southeast Asia flights?

There are 2 cabin classes available to choose from on London to Southeast Asia flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on London to Southeast Asia flights?

No. A direct flight is the cheapest option for a flight between London to Southeast Asia.

Cheap London to Southeast Asia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London to Southeast Asia

Fastest flight time

11h 25m

Direct flights

Every day

Airports in Southeast Asia

1 airport
The fastest flight from London to Southeast Asia takes 11h 25m
Direct flights go from London to Southeast Asia every day.
There is 1 airport near Southeast Asia: Bangkok Suvarnabhumi (BKK)
Search flight deals

  • When did momondo last update prices for flights from London to Southeast Asia?

    Prices for flights from London to Southeast Asia refresh daily.

  • How old do you have to be to fly from London to Southeast Asia?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London to Southeast Asia.

  • What documentation or ID do you need to fly to Southeast Asia?

    The travel and health documents you'll need for your trip to Southeast Asia may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's licence and a passport that is valid for six months after your intended arrival at Southeast Asia. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from London to Southeast Asia?

Best airlines flying from London to Southeast Asia

Compare and see reviews for airlines that fly from London to Southeast Asia with momondo
Airline
Rating
Free Cancellation
Price
Air ChinaPriceFrom €445Free CancellationRating
7.2
117 reviews
Search Air China flights

Why use momondo?

Why should I use momondo to find a flight deal from London to Southeast Asia?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from London to Southeast Asia . Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from London to Southeast Asia with flexible booking policies on momondo?

All flight searches from London to Southeast Asia on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from London to Southeast Asia?

momondo provides multiple filters to help you find the best flight to Southeast Asia from London. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from London to Southeast Asia right now. Can momondo alert me if prices change?

Yes. momondo can track prices for London to Southeast Asia flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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